import random

def generate_random_string(size=20):
    return ''.join(random.choice('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ') for _ in range(size))

if __name__ == "__main__":
    data = generate_random_string()
    print(data)
